Window lock



Get. 10, 1950 L. F. SURRIDGE WINDOW LOCK 2 Sheets-Sheet 1 Filed March 1, 1946 IN VEN TOR. 1024.55 75 Serf/"2143 6.

FTTP/TA/E/ci Oct. 10, 1950 L. F. SURRIDGE 2,524,941?

WINDOW LOCK Filed March 1, 1946 2 Sheets-Sheet 2 INVEN TOR.

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QEE-EE- y Patenteci Oct. TO, 1950 UNITED STATES PATENT OFFICE WINDOW LOCK Louis F. Surridge Detroit, Mich. Application March 1, 1946, Serial No. 651,337

, 2 Claims. 1

This invention relates to window particularly to a lock for securing the upper and lower window sashes against opening beyond a predetermined set position.

Window locks have been provided heretofore for securing the windows in predetermined open position against unauthorizedfurther opening. These were usually the type which required the lock to be positively secured by screws, bolts and the like to the sash, which marred the sash and the associatedframes with which the lock engaged. i

The present invention pertains to a locking device which is secured to the frame of the window without the application of bolts, screws, nails and the like, being disposed angularly in the sash run inwhich the'windo'w sash slides. l'he device embodies 'a link which is wedged in the sash run having an arm freely pivoted thereon. When the sash abuts the link it wedges it in the sash run to securely bind it therein, thereby pre- :F

venting further upward movement of the lower sash. The arm, freely pivoted on the device, eng'a'gestheupper sash when angularly disposed above a horizontal plane, which prevents the upper sash frombeing moved downwardly beyond a set position as the arm will bind the sashin its run.

The link and the arm preferably have laterally extending fingers or pins which may have a resilient material applied thereto to prevent marring. Theresilient material may be small lengths of rubber tube stretched over the arms, or the arms may have rubber, resin or like material directly adhered thereto through vulcanization or like processes. Itjwas found that a single locking device'is all that is required for a window frame having a pairof windows therein and that this device may be removed from any one window and applied to another by simply reversing the rotating movement of the link in. the sash run to release it therefrom.

Accordingly, themain objects of the invention are: to providealocking device for .a window which is rigidlysecured in position through theforce applied theretoby the operation of the window; toprovide. alocking device having a locks, and go a horizontal plane through the pivot and secures the upper window against downward movement; to apply a resilient material to projecting arms of a locking device which prevents the marring of the frame and sash of the windows when engaged thereby to secure the windows against unauthorized further movement; and, in general,

to provide a locking device for a window which is' simple in construction, positive in operation, and economical of manufacture.

Other objects and features of novelty of the invention will be specifically pointed out or will become apparent when referring, for a better understanding of the invention, to the following description taken in conjunction with the accompanying drawings, wherein:

Figure 1 is a broken perspective View of a window frame having an upper and lower window sash locked in position by a locking device embodying features of this invention;

Fig. 2 is a view in elevation of the structure 11- lustrated in Fig. 1, with the upper and lower sash in positive locked position against further downward and upward movement, respectively;

' Fig. 3 is a plan view of the structure illustrated in Fig. 2

Fig. 4 is a sectional view of the structure illustrated in Fig. 3, taken on the line fi.4 thereof;

Fig.5 is a view of structure, similar to that i1- lustrated in Fig. 2, showing a further form which the invention may assume;

Fig. 6 is a plan view of the structure illustrated in Fig. 5;

[ll-shaped link which is angularly disposed in the slide run in the window frame to .be rigidly secured therein when abutted bythe window as it is raised to prevent further movement there: of to apply a freely pivoted arm to the link secured in the sash runof a window frame when abutted by the lower windowwhen raised, which arm engages the fac of thefupper window above Fig. 7 is a view of structure, similar to that illustrated in Fig. 1, showing a stillfurther form of the invention;

view of the structure illustrated illustrated in Fig. 8.

A window of conventionalform is illustrated, embodying a frame i having sash runs 2 and 3 for a lower window sash 4 and an upper window sash 5, respectively. Locking elements are conventionally employed on the lower part of the upper sash and on the upper part of thelower sash for locking the two sashes in closed posi tion. 'When, however, it is desiredto ventilate a room, the lock is unlatched and the upper window sash is lowered or the lower window sash is raised, or both sashes may beraised and lowered,

respectivelyj depending upon the amount and type of ventilation desired. When the conventional latch. is'unlocked in this manner, access may be had by anyone from the exterior of the window into the room being ventilated by raising the lower window sash or lowering the upper window sash. A simple and positive locking device for preventing such unathorized entrance is therefore very desirable.

The locking device of the present invention embodies a U-shaped link ii having a web portion 1 and two extending fingers 8, with the web portion 1 dispbsed angularly to a horizontal plane when the arm portions are disposed in a vertical plane. This angle was found to be approximately 12 to produce the proper binding of the linkfi to the side faces of the sash run 2 when the low; ermost finger 8 is contacted by the top of the lower window sash when raised, This produces a slight counterclockwise shifting of the link in the sash run which binds the link therein and V rigidl secures it within the run.

A freely pivoted arm Sis secured by a shoulder rivet ID to the web portion 1 of the link 5, preferably in ofif-center relation to the ends of the web portion away from the upper window sash 5, as clearly illustrated inF-ig. 3 The arm 9 has a finger H extending at right angles thereto in the same direction .as the fingers 8 extend from the web I. The arm 9 is disposed at an angle to the horizontal plane when the finger H is disposed in the vertical plane, as clearly illustrated in Fig. 2, the angle being approximately 12, The finger ll engages. the face of the upper window sash 5 and while permitting a closing movement thereto positively prevents the downward or opening movement thereof because of the angular relation of the arm 9.

The fingers 8 and II are provided with a frictional element [2 which may be short portions of a rubber tube or which may be a frictional and nonmarring material such as rubber, plastic and the like, which is directly adhered to the surface of the fingers. The material l2 will not only prevent mar-ring but will provide a frictional grip which will produce the binding of the link 6 to the opposite walls of the sash run 2 and the securing of the finger ll against the face of the window sash 5. It is contemplated that the link E5 and arm 9 will be shifted two or three degrees when a pressure is applied thereto through the raising ofthe lower window sash l and the lowering of the upperwindow sash 5 to have the link and arm disposed at approximately 10 to a horizontal plane. This provides a positive binding force to prevent the movement of the lower window sash upwardly and the'upp er window sash downwardly beyond a desired set position.

By a counterclockwise rotative movement to the link 5, the locking device isreleased from the window frame and may be shifted to a different position therein or applied .to a different frame, as the case may be. It is to ben'oted, however, that once the locking device is applied to a window, it will remain in position to always prevent the lower window sash from being raised beyond a predetermined desired amount while the upper window sash will similarly be locked against a lowering movement and may be adjusted from time to timeby slightly raising, the upper window to release the arm 9, and by holding the arm out of contact with the upper window sash, the sash may be further adjusted downwardly. This, however, must be accomplished from the inside of the building as the position of the locking device in the window. frame is such as to be out of the reach of any oneattempting to gain entrance from the exterior of the building.

Referring to Figs. 5 and 6, a further form of the invention is illustrated, that wherein a link I3 has knurled pins I4 and I5 disposed one at each of its ends for engaging the inner faces of the sash run 2 with the link disposed at an angle to the horizontal. The knurled pin I4 is pressfitted in an aperture in one end of the link I3 on the projecting end of which an arm i6 is freely pivoted and retained thereon by suitable means, herein illustrated as by a screw I1. The arm [6 has on its end opposite to that which is pivoted on the projection of the pin I l, a knurled pin l8 which is disposed in position to engage the inner face of the upper sash 5, with the arm disposed at an angle to the horizontal. The locking element of Figs. 5 and 6 functions the same as the locking element illustrated in Figs 1 to 4, the link l3 being wedged between the opposite faces of the sash run 2 and the arm [6 being wedged between the end of the link [3 and the face of the window sash 5. The counterclockwise rotation of the link 13 releases it from the sash run, while a clockwise rotation produced manually or by the upward movement of the window sash 4, securely locks the link in the sash run.

Referring to Figs. 7; 8 and 9, a still further form of the invention is illustrated, that wherein a link i9 is of L shape, having a web portion 20 from which a flange 2| is formed from the plane thereof through an angle of substantially 82. This provides an angle of substantially 98 from the plane of the web 20 and the flange 2! so that the end of the flange will first engage one of the faces of the sash run '2 and lock the link against outward movement therefrom. An aperture 22 is provided through the web portion 20 of the link i9 interjacent its ends, in which a stud 23 on the end of a knurled cylindrical pin 24 is press-fitted, having a portion extending beyond the web portion 20 on which an arm 25 is freely pivoted.

The arm 25 is retained on the end of the stud 23 by staking the end of the stud, asat 26, or by any other suitable means. The pin 24 engages one face of the sash run 2, while the end of the flange 2i engages the opposite face when the link is disposed at an angleof approximately 12 with the horizontal. The lower window sash 4 will strike the flange 2! to cause the bar to be rotated counterclockwise and to be more firmly locked in position in the sash run 2. It will be noted that the flange 2| is not only bent angularly to the plane of the web portion 20, but also is twisted relative thereto to be in a vertical plane, as illustrated in Fig. 9, when the web portion 20 is in looking position disposed at ana-ngle of substan tially 12 to the horizontal. The arm 25 is bent outwardly at 27 and inwardly to form a finger 28 which is disposed parallel to thefa'e of the upper window sash 5 when the arm 25 is disposed at an angle of substantially 12 to the horizontal. This occurs when the finger 28 or the frictional material l2 thereon is in engagement with the face of the upper window sash 5.

It will be noted further that when in position to lock the upper and lower window sashes, as

. disposed at an angle of 12 below the horizontal and that the arm 25 is disposed 12 above the horizontal. When the window Sash 4 'is raised and strikes against the flange 21 of the link Hi, the .link is urged counterclockwise to be more firmly secured in the sash run'Z. when the window sash 5 is locked in position by the arm 25, the further downward movement of the sash 5 applies a downward force to the pin 21 which attempts to further rotate the link 19 in a counterclockwise direction to further lock the link within the sash run 2. Thus, the attempt to open either of the window sashes 4 and 5 causes the link l9 to be urged in a counterclockwise direction to be more securely anchored between the faces of the sash run '2.

When the locking device is to be removed from the window frame, the upper window sash is moved upwardly to release the arm 25 and the lower window sash 4 is moved down out of engagement with the flange 2| of the link 19. The device is then grasped by the operator and a force is applied to the extending end 29 thereof which rotates the link clockwise and releases it completely from the faces of the sash run 2 so that it may be removed therefrom. The locking device may again be applied to the same or another window frame by inserting the flange 2! and pin 24 between the faces of the sash run 2 and moving the end 29 downwardly to rotate the link counterclockwise within the sash run. The flange 2| and the pin 24 engage the opposite faces of the run and the link is secured in locked rela-' tion therewith, as illustrated in Fig. 9. The raising of the lower window sash 4 against the flange 2% more securely locks the link I9 within the sash run. The engagement of the finger 28 with the face of the upper window sash 5 upon the downward movement of the sash securely locks the sash against further downward movement. The

fingers on the end of the link may be adjustable.

toward and awayfrom each other so as to be bound directly between the opposite faces. of the sash run. In a similar manner, the arm may have the end flange adjusted upwardly and inwardly thereon to be forced against the face of the upper window sash to bind it against movement. Broadly, the present invention pertains to a link which may be bound between opposite faces of the sash run and an arm thereon which may be bound against the face of the upper window sash to lock both sashes against movement beyond a predetermined set position.

What is claimed is:

1. A locking device for upper and lower sliding 1 window sashes in a window frame including, in combination, a link having a pair of spaced ,projecting fingers on one side thereof, an arm having a projetcing finger on one end thereof, and a pivot for securing the arm in freely pivoted relation to the link on the side opposite to that containing the projecting fingers in a position to engage the face of the upper window sash and to form a binding lock therewith against downward movement when said link fingers are locked in the sash run above the lower sash to limit the upward movement of the lower sash.

2. A locking device for upper and lower sliding window sashes in a window frame including, in combination, a link having a pair of spaced projecting fingers on one side thereof disposable between the faces of the sash run above the lower sash to limit the upward movement of the lower sash, an arm having a projecting fingerlon one end thereof, a pivot for securing the arm in freely pivoted relation to the link on the side opposite to that containing said projecting fingers in a position to engage the face of the upper win- 7 dow sash and to form a binding lock therewith against downward movement, and a friction material secured to said fingers for protecting the surfaces of said faces and for aiding in the binding action therewith.

LOUIS F. SURRIDGE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS 

